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    Chapter 8 – Precast Pretensioned Concrete Girders 8-i BRIDGE DESIGN PRACTICE FEBRUARY 2015 CHAPTER 8 P ... 8.2.3 Methods to Vary Strand Eccentricity and Force ... stressing stands, jacks, and hold-downs/hold-ups to produce the

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    The Paul Stressing System includes a strand pushing machine, 25-ton stressing jack, and 16- and 20-ton mini-jacks. Basic model stressing jacks can be equipped with exchangeable interior parts suiting different tendon configurations, allowing them to be used with many prestressing systems.

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    The jack should be opened at least 4 inches so that it does not get “hung up” in case the wedges fail. The detensioning procedure be performed shortly after the normal stressing operation. Over time, the wedges deformed inside the anchor cavity and form a “lock” with the strand and anchor.

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